How is slag removed from the furnace?

How is slag removed from the furnace?

The slag removal process is carried out by dispersing natural granular perlite on top of the molten metal. The coagulating, encapsulating effect of the perlite allows slag to be easily removed from ladles and furnaces.

What is induction furnace slag?

Pollution Control Board of various state has considered slag while making mild steel in induction furnaces as hazardous. The emission from induction furnace include suspended particulate matter, oxides of sulphur, oxides of nitrogen, and CO2 emissions will be more during charging of material to furnace.

How do you remove slag from molten iron?

1) A method of removing slag from the surface of molten metal by suction after adding a fluidity modifier to the slag to increase its fluidity. 2) A method according to Item 1) wherein the slag floating on the surface of the molten metal is a blast furnace slag.

How do you melt an induction furnace?

Induction melting is a process where metal is melted into liquid form in an induction furnace’s crucible. The molten metal is then poured from the crucible, usually into a cast.

What is slag remover?

SLAG REMOVER (Un-Expanded Perlite) is used for removing slag from Molten metal. It is in the form of Granules. It is used in Cupola Furnace, Induction Furnace & Pouring ladle.

What do you do with a slag?

According to the National Slag Association website, common uses for slag include:

1. Aggregate in granular base, embankments, engineered fill, highway shoulders, and hot mix asphalt pavement.
2. Concrete aggregate in bridge construction and in concrete masonry.
3. Agricultural applications to increase crop yield.

How does induction furnace work?

In the induction furnace, a coil carrying alternating electric current surrounds the container or chamber of metal. Eddy currents are induced in the metal (charge), the circulation of these currents producing extremely high temperatures for melting the metals and for making alloys of exact composition.

Why is it important to remove slag from iron?

During iron melting, the scrap material is exposed to high temperature and oxygen. In iron metallurgy, control of slag formation is essential to reach the alloy target chemistry by assisting in the removal of impurities and protecting the furnace refractory lining from excessive wear.

What are the advantages of using induction furnace rather than cupola?

Besides, cupolas emit many pollutants, specifically dust, making induction a cleaner and safer way to melt cast iron. Another thing is that induction furnaces do not require an arc or combustion, making the temperature safer to work with.

What happens to slag from blast furnace?

Granulated Blast Furnace Slag If the molten slag is cooled and solidified by rapid water quenching to a glassy state, little or no crystallization occurs. This process results in the formation of sand size (or frit-like) fragments, usually with some friable clinkerlike material.

How to dephosphorize slag in induction furnace?

Even if one uses basic or neutral lining in induction furnace and maintains basicity of slag by adding Fluxes and blowing oxygen in the furnace to remove phosphorus, the process becomes costlier and longer, and results in reduction of production. Therefore, dephosphorization in induction furnace is neither practiced nor technically suggested.

What happens to the slag after the metal is melted?

Once the melting is complete, the slag is skimmed off. Slag generated during melting has tendency to stick on the furnace wall. This reduces volume of furnace hence reduces metal output per heat. Superheating of metal is done at higher temperature and held for few minutes.

What are the main raw materials for steelmaking in induction furnace?

The main raw materials for steelmaking in induction furnace are (i) steel scrap, (ii) iron scrap or/and pig iron, (iii) sponge iron, (iv) carburizer, and (v) additives. Out of these the first three are metallics.

What is indinduction melting furnace?

Induction melting furnaces in India were first installed to make stainless steel from imported SS Scrap. But experimented in making mild steel fr om steel m elting scrap, they succeed ed. More firms in northern India